Stackable chair



FIG. 1 is a perspective view of a stackable chair, looking toward the right front corner, showing my new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a stackable chair, as shown and described. 